WO2008146981A1 - A spinal screw module - Google Patents

A spinal screw module Download PDF

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Publication number
WO2008146981A1
WO2008146981A1 PCT/KR2007/003485 KR2007003485W WO2008146981A1 WO 2008146981 A1 WO2008146981 A1 WO 2008146981A1 KR 2007003485 W KR2007003485 W KR 2007003485W WO 2008146981 A1 WO2008146981 A1 WO 2008146981A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert
screw rod
spinal
screw
hollow
Prior art date
Application number
PCT/KR2007/003485
Other languages
French (fr)
Inventor
Kyu Jung Cho
Min Sik Shin
Jin Soon Kim
Original Assignee
Gs Medical Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gs Medical Co., Ltd. filed Critical Gs Medical Co., Ltd.
Publication of WO2008146981A1 publication Critical patent/WO2008146981A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/74—Devices for the head or neck or trochanter of the femur
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone

Definitions

  • the present invention relates to a spinal screw module, and more particularly, to a spinal screw module in which a plurality of slits are formed in a body of a screw that is to be fixedly inserted into a spinal pedicle and an insert is inserted into the body of the screw to expand the body of the screw so that the screw is prevented from being separated from the spinal pedicle.
  • scoliosis is a disease causing vertebrae to be twisted and bent. If scoliosis is left as it is, a deformation of the vertebrae is advanced continuously, and severe deformity is ultimately caused by scoliosis. Due to the deformity, a complication such as a deformation of viscera and the like are caused, which makes it difficult to live daily life conveniently. This scoliosis can be completely recovered by mounting an assist device or performing a surgical operation according to a bent angle of the vertebrae.
  • the patient will live semi-permanently in a state where the spinal screw is implanted into the vertebrae.
  • the spinal screw implanted into a human body can be deformed or loosened by a physical activity for a long time, so that the spinal screw may be separated.
  • there is a problem that the spinal screw is more likely to be separated from the spinal pedicle due to a low bone density.
  • An object of the present invention is to provide a spinal screw module, wherein a body of a spinal screw is slit in the longitudinal direction to be divided into a plurality of strips, a hollow is formed in the body to enable an insert to be inserted in the hollow, and the insert is inserted into the hollow to allow the body to expand, thereby preventing the coupling between the spinal screw and the vertebrae from loosening or the spinal screw from being separated from the vertebrae by physical activities.
  • a spinal screw module which comprises a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod and a plurality of slits for slitting the body in a longitudinal direction, the head being formed at an upper portion of the screw rod and having a U-shaped recess and a threaded portion formed within the head; and an insert to be inserted into the hollow so as to increase a distance between the slits.
  • a spinal screw module which comprises a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod and a plurality of slits for slitting the body in a longitudinal direction, the head being formed at an upper portion of the screw rod and having a U-shaped recess and a threaded portion formed within the head; a first insert to be inserted into the hollow through a distal end of the screw rod, the first insert having a threaded portion formed at one side thereof and a protrusion structure formed at the other side thereof to prevent the other side of the first insert from being inserted into the hollow of the screw rod; a coupling ring provided between the screw rod and the first insert to restrict the distal end of the screw rod; a second insert formed with a fixing recess, the fixing recess being open
  • a spinal screw module which comprises a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod, a plurality of slits for slitting the body up to a distal end of the screw rod in a longitudinal direction, and a connection portion for connecting distal end segments of the screw rod, the head being formed at an upper portion of the screw rod and having a U- shaped recess and a threaded portion formed within the head; a first insert to be inserted into the hollow through the distal end of the screw rod, the first insert having a threaded portion formed at one side thereof and a protrusion structure formed at the other side thereof, the protrusion structure having an inclined surface and a diameter larger than that of the hollow so as to break the connection portion and expand the distal end segments of the screw rod when the pro
  • a spinal screw module of the present invention a hollow is formed in a body of a screw rod to be inserted into a spinal pedicle of a human body, a plurality of slits are formed on the body in the longitudinal direction, an insert is inserted into the hollow after fixing the spinal screw to the spinal pedicle, whereby the body of the screw rod expands to securely fix the screw to the spinal pedicle. Therefore, there are advantages in that it is possible to prevent the spinal screw from being deformed or the coupling between the spinal screw and the spinal pedicle from loosening by physical activities for a long time, whereby the spinal screw can be prevented from being separated from the spinal pedicle.
  • the spinal screw module according to the present invention can be utilized semi-permanently without deformation or separation of the spinal screw.
  • FIG. 1 is an exploded perspective view of a spinal screw module according to a first embodiment of the present invention
  • FIG. 2 is a sectional view of the spinal screw module according to the first embodiment of the present invention.
  • Fig. 3 is an exploded perspective view of a spinal screw module according to a second embodiment of the present invention.
  • Fig. 4 is a sectional view of the spinal screw module according to the second embodiment of the present invention.
  • Fig. 1 is an exploded perspective view of a spinal screw module according to a first embodiment of the present invention
  • Fig. 2 is a sectional view of the spinal screw module according to the first embodiment of the present invention.
  • a spinal screw module according to the present invention comprises a spinal screw 100 including a screw rod 105 fixedly inserted into a spinal pedicle and having a hollow 102 formed in a central portion of a body of the screw rod and a plurality of slits 106 for slitting the body in the longitudinal direction, and a head 101 formed in an upper portion of the screw rod 105 and having a U-shaped groove 104 and a threaded portion 103 formed in the head; and an insert 110 inserted into the hollow 102 to enlarge a width of the slit 106.
  • the spinal screw 100 is made of titanium (Ti) and installed to link spinal pedicles to each other using a bar-shaped rod.
  • the spinal screw 100 includes the screw rod 105 inserted into the spinal pedicle and the head 101 for linking the rod thereto, wherein the screw rod 105 has a threaded portion formed on a surface of the body thereof so that the screw rod can be rotated and thus inserted into the spinal pedicle, and the head 101 is formed with the U-shaped groove 104 for linking the rod thereto.
  • the threaded portion 103 is formed on a wall surface of the U-shaped groove 104 of the head 101 to fix the rod using a nut after the rod is inserted.
  • the hollow 102 is formed in the central portion of the body of the screw rod 105, wherein the hollow has a diameter gradually decreasing toward a distal end of the screw rod.
  • the plurality of slits 106 are formed in the longitudinal direction of the body to be disposed at regular intervals.
  • the hollow 102 is tapered as it goes to the distal end, when the insert 110 is inserted into the hollow 102, the insert 110 pushes outwardly the screw rod 105 to increase a distance between the slits 106.
  • the screw rod is inserted into the spinal pedicle in a state where distal end segments of the screw rd 105 are in contact with each other when the screw rod is inserted into the spinal pedicle. If the insert 110 is inserted into the hollow 102 after the spinal screw 100 is inserted into the spinal pedicle, the distal end segments of the screw rod 105 become spaced apart from each other. As described above, if the spinal screw 100 is inserted into the spinal pedicle in a state where the distal end segments of the screw rd 105 are in contact with each other, it is possible to prevent the spinal pedicle of a patient from be damaged.
  • the spinal screw 100 is made of titanium that is harder than the spinal pedicle, and the distal end segment of the screw rod 105 is formed to be sharp.
  • the spinal screw can be inserted into the spinal pedicle in a state where the distal end segments of the screw rod 105 are spaced apart from each other.
  • the insert 110 has a bar shape with a sharp portion formed at one end thereof and a threaded portion 114 formed at the other end thereof.
  • the insert 110 has a tool-receiving groove 112 formed on an upper surface thereof so that the insert can be rotated by means of a tool such as a screwdriver.
  • the tool-receiving groove may have a slot or cross shape.
  • FIG. 2 shows a use state of the spinal screw module according to the first embodiment of the present invention. If the insert 110 is inserted into the hollow 102 of the spinal screw 100, the distal end segments of the screw rod 105 are spaced apart from each other and a distance between the slits 106 is increased to thereby be expanded. When the body of the screw rod 105 is expanded in the spinal pedicle, the screw rod 105 comes into closer contact with the spinal pedicle to prevent the coupling between the spinal screw and the spinal pedicle from loosening or the spinal screw from being separated from the spinal pedicle by physical activities.
  • Fig. 3 is an exploded perspective view of the spinal screw module according to the second embodiment of the present invention
  • Fig. 4 is a sectional view of the spinal screw module according to the second embodiment of the present invention.
  • the spinal screw 200 includes the screw rod 205 inserted into the spinal pedicle and the head 201 provided for linking the rod thereto. As compared with the spinal screw 100 shown in Fig. 1, a structure of the head 201 of the spinal screw 200 is the same as that of the head of the spinal screw 100 except that a sharp portion is not formed at a distal end of the screw rod 205.
  • a threaded portion is formed on a surface of the body of the screw rod 205 to allow the screw body to be rotated and thus inserted into the spinal pedicle.
  • the hollow 202 is formed in the body of the screw body so that the first insert 240 and the second 210 can be inserted into the hollow.
  • the plurality of slits 206 are formed at regular intervals on the body of the screw rod 205 in the longitudinal direction of the body. The slits 206 are formed on the body of the screw rod 205 in the longitudinal direction and formed up to a position spaced apart from the distal end so that the distal end is not divided.
  • the coupling ring 230 is coupled to a distal end of the screw rod 205, wherein the coupling ring 230 restricts the distal end of the screw rod 205 and is fixed to the distal end of the screw rod 205 by inserting the first insert 240.
  • the coupling ring 230 is used for preventing the distal end of the screw rod 205 from bursting and expanding by pressure when the spinal screw 200 is inserted into the spinal pedicle and then the body of the screw rod 205 is expanded.
  • a threaded portion 242 is formed on a distal end of the first insert 240 and a wing
  • the wing 244 is formed on the other distal end for restricting the distal end of the screw rod 205.
  • the wing 244 formed on the first insert 240 distributes the force generated by rotation uniformly to the distal end of the screw rod 205 when the second insert 210 is rotated.
  • the wing 244 also prevents the distal end of the screw rod 205 from being in direct contact with the spinal pedicle of a patient, so that a damage of the spinal pedicle can be prevented.
  • the fixing recess 214 having one side opened and a threaded portion formed therein is formed in the second insert 210, and the second insert 210 is inserted into the hollow 202 through the head 201.
  • the distal end of the screw rod 205 is fixedly inserted into the fixing recess 214.
  • the second insert 210 has a tool-receiving groove 212 formed on an upper surface thereof so that the second insert can be rotated by means of a tool such as a screwdriver and the like.
  • the ring-shaped washer 220 Prior to inserting the second insert 210 into the hollow 202 of the screw 200, the ring-shaped washer 220 is inserted into the hollow.
  • the hollow 202 is formed with a catching protrusion 202 for positioning the washer 220, so that the washer is placed on the catching protrusion.
  • the catching protrusion is formed at a depth corresponding to a length of the second insert 210, so that when the washer 220 is inserted into the hollow, the second insert 210 can be prevented from being moved downward below the catching protrusion.
  • the washer 220 prevents the second insert 210 from being forcibly moved downward in the hollow 202 by the coupling force between the first insert 240 and the second insert 210 when the second insert 210 is rotated.
  • FIG. 4 shows a use state of the spinal screw module according to the second embodiment of the present invention. If the spinal screw 200 is inserted into the spinal pedicle of a patient and the second insert 210 is then rotated, a coupling degree between the threaded portion 242 of the first insert 240 and the fixing groove 241 of the second insert 210 is increased. Due to the increase of the coupling degree, pressure is applied from the wing 244 to the distal end of the screw rod 205, so that the body of the screw body 205 is bent and the width of the slits 206 is increased to expand the body of the screw rod 205.
  • the screw body 205 comes into closer contact with the spinal pedicle to prevent the coupling between the spinal screw and the spinal pedicle from loosening or the spinal screw from being separated from the spinal pedicle by physical activities.
  • the spinal screw module according to the third embodiment of the present invention has the structure similar to that of the spinal screw module according to the second embodiment.
  • the slit is formed on the spinal screw fixedly inserted into the spinal pedicle up to the distal end of the screw rod, and a connection portion is formed for connecting the distal end segments of the screw rod to prevent the distal end segments thereof from being spaced apart from each other.
  • the connection portion of the distal end segments of the screw rod is broken to allow the body of the screw rod to be expanded.
  • a threaded portion is formed on one side of the first insert so that the first insert can be coupled with the second insert, and a protrusion structure is formed on the other side thereof so that the protrusion structure is inserted into the hollow of the screw rod and breaks the connection portion to thereby expand the distal end of the screw rod.
  • an inclined surface is formed on a side of the protrusion structure, i.e., on a surface which is in contact with the screw rod so that the first insert is easily inserted into the hollow, and a sharp portion is formed on the other side thereof so that the first insert is easily inserted into the spinal pedicle.
  • a rhombic or diamond shape may be used, so that the connection portion can be easily broken to expand the body of the screw rod.
  • a spinal screw module according to the present invention, a body of a screw is expanded and then securely fixed to the vertebrae of a patient, so that the coupling does not loosen or the spinal screw is not separated from the spinal pedicle by physical activities. Consequently, the spinal screw module can be used semi-permanently. [50] Accordingly, the spinal screw module according to the present invention can be valuably employed in surgical operation regarding various spinal pedicles.

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  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Heart & Thoracic Surgery (AREA)
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Abstract

The present invention relates to a spinal screw module, and more particularly, to a spinal screw module in which a plurality of slits are formed in a body of a screw that is to be fixedly inserted into a spinal pedicle and an insert is inserted into the body of the screw to expand the body of the screw so that the screw is prevented from being separated from the spinal pedicle. A spinal screw module according to the present invention shows advantages in that it is possible to prevent the spinal screw from being deformed or the coupling between the spinal screw and the spinal pedicle from loosening by physical activities for a long time, whereby the spinal screw can be prevented from being separated from the spinal pedicle.

Description

Description A SPINAL SCREW MODULE
Technical Field
[1] The present invention relates to a spinal screw module, and more particularly, to a spinal screw module in which a plurality of slits are formed in a body of a screw that is to be fixedly inserted into a spinal pedicle and an insert is inserted into the body of the screw to expand the body of the screw so that the screw is prevented from being separated from the spinal pedicle.
[2]
Background Art
[3] In general, herniation of intervertebral disk (spondylodiscitis), scoliosis and the like have been known as spinal diseases, the patient having the spine partially damaged could not perform activities required for daily life. Although a damaging degree of the spine is not severed, a damaged portion of the spine is pressed by or comes into contact with an adjacent portion, which causes a pain.
[4] Accordingly, for the patient having the spine which is partially damaged or injured, a surgical operation should be performed for supporting and correcting the damaged spine by using an artificial aid to a damaged portion of the spine, so that the patient can live comfortably his/her own life.
[5] In the spinal problems, scoliosis is a disease causing vertebrae to be twisted and bent. If scoliosis is left as it is, a deformation of the vertebrae is advanced continuously, and severe deformity is ultimately caused by scoliosis. Due to the deformity, a complication such as a deformation of viscera and the like are caused, which makes it difficult to live daily life conveniently. This scoliosis can be completely recovered by mounting an assist device or performing a surgical operation according to a bent angle of the vertebrae.
[6] In surgical operations for scoliosis, there is a spinal screw insertion manner in which screws are fixedly inserted into the bent vertebrae to correct them. In such surgical operation, the spinal screws are inserted into the bent vertebrae and linked to each other using a rod, thereby assisting the spine to be recovered to a normal status.
[7] However, the patient will live semi-permanently in a state where the spinal screw is implanted into the vertebrae. The spinal screw implanted into a human body can be deformed or loosened by a physical activity for a long time, so that the spinal screw may be separated. In case of an osteoporotic patient, there is a problem that the spinal screw is more likely to be separated from the spinal pedicle due to a low bone density.
[8] Disclosure of Invention
Technical Problem
[9] The present invention is conceived to solve the aforementioned problems. An object of the present invention is to provide a spinal screw module, wherein a body of a spinal screw is slit in the longitudinal direction to be divided into a plurality of strips, a hollow is formed in the body to enable an insert to be inserted in the hollow, and the insert is inserted into the hollow to allow the body to expand, thereby preventing the coupling between the spinal screw and the vertebrae from loosening or the spinal screw from being separated from the vertebrae by physical activities.
[10]
Technical Solution
[11] According to a first aspect of the present invention for achieving the objects, there is provided a spinal screw module, which comprises a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod and a plurality of slits for slitting the body in a longitudinal direction, the head being formed at an upper portion of the screw rod and having a U-shaped recess and a threaded portion formed within the head; and an insert to be inserted into the hollow so as to increase a distance between the slits.
[12] In addition, according to a second aspect of the present invention for achieving the objects, there is provided a spinal screw module, which comprises a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod and a plurality of slits for slitting the body in a longitudinal direction, the head being formed at an upper portion of the screw rod and having a U-shaped recess and a threaded portion formed within the head; a first insert to be inserted into the hollow through a distal end of the screw rod, the first insert having a threaded portion formed at one side thereof and a protrusion structure formed at the other side thereof to prevent the other side of the first insert from being inserted into the hollow of the screw rod; a coupling ring provided between the screw rod and the first insert to restrict the distal end of the screw rod; a second insert formed with a fixing recess, the fixing recess being open at one side thereof so that the second insert can be coupled to an upper portion of the first insert; and a washer to be inserted into the hollow of the spinal screw so as to determine a location of the second insert.
[13] Further, according to a third aspect of the present invention for achieving the objects, there is provided a spinal screw module, which comprises a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod, a plurality of slits for slitting the body up to a distal end of the screw rod in a longitudinal direction, and a connection portion for connecting distal end segments of the screw rod, the head being formed at an upper portion of the screw rod and having a U- shaped recess and a threaded portion formed within the head; a first insert to be inserted into the hollow through the distal end of the screw rod, the first insert having a threaded portion formed at one side thereof and a protrusion structure formed at the other side thereof, the protrusion structure having an inclined surface and a diameter larger than that of the hollow so as to break the connection portion and expand the distal end segments of the screw rod when the protrusion structure is inserted into the hollow; a second insert formed with a fixing recess, the fixing recess being open at one side thereof so that the second insert can be coupled to the threaded portion of the first insert; and a washer to be inserted into the hollow through the head of the spinal screw so as to determine a location of the second insert. [14]
Advantageous Effects
[15] According to a spinal screw module of the present invention, a hollow is formed in a body of a screw rod to be inserted into a spinal pedicle of a human body, a plurality of slits are formed on the body in the longitudinal direction, an insert is inserted into the hollow after fixing the spinal screw to the spinal pedicle, whereby the body of the screw rod expands to securely fix the screw to the spinal pedicle. Therefore, there are advantages in that it is possible to prevent the spinal screw from being deformed or the coupling between the spinal screw and the spinal pedicle from loosening by physical activities for a long time, whereby the spinal screw can be prevented from being separated from the spinal pedicle.
[16] In addition, in case of an application to an osteoporotic patient having low bone density, it is possible to bring the spinal screw into closer contact with the spinal pedicle. Therefore, the spinal screw module according to the present invention can be utilized semi-permanently without deformation or separation of the spinal screw.
[17]
Brief Description of the Drawings
[18] Fig. 1 is an exploded perspective view of a spinal screw module according to a first embodiment of the present invention;
[19] Fig. 2 is a sectional view of the spinal screw module according to the first embodiment of the present invention;
[20] Fig. 3 is an exploded perspective view of a spinal screw module according to a second embodiment of the present invention; and [21] Fig. 4 is a sectional view of the spinal screw module according to the second embodiment of the present invention. [22]
Best Mode for Carrying Out the Invention
[23] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to accompanying drawings.
[24] Fig. 1 is an exploded perspective view of a spinal screw module according to a first embodiment of the present invention, and Fig. 2 is a sectional view of the spinal screw module according to the first embodiment of the present invention.
[25] Referring to Fig. 1 , a spinal screw module according to the present invention comprises a spinal screw 100 including a screw rod 105 fixedly inserted into a spinal pedicle and having a hollow 102 formed in a central portion of a body of the screw rod and a plurality of slits 106 for slitting the body in the longitudinal direction, and a head 101 formed in an upper portion of the screw rod 105 and having a U-shaped groove 104 and a threaded portion 103 formed in the head; and an insert 110 inserted into the hollow 102 to enlarge a width of the slit 106.
[26] The spinal screw 100 is made of titanium (Ti) and installed to link spinal pedicles to each other using a bar-shaped rod.
[27] The spinal screw 100 includes the screw rod 105 inserted into the spinal pedicle and the head 101 for linking the rod thereto, wherein the screw rod 105 has a threaded portion formed on a surface of the body thereof so that the screw rod can be rotated and thus inserted into the spinal pedicle, and the head 101 is formed with the U-shaped groove 104 for linking the rod thereto. The threaded portion 103 is formed on a wall surface of the U-shaped groove 104 of the head 101 to fix the rod using a nut after the rod is inserted.
[28] The hollow 102 is formed in the central portion of the body of the screw rod 105, wherein the hollow has a diameter gradually decreasing toward a distal end of the screw rod. The plurality of slits 106 are formed in the longitudinal direction of the body to be disposed at regular intervals. Here, since the hollow 102 is tapered as it goes to the distal end, when the insert 110 is inserted into the hollow 102, the insert 110 pushes outwardly the screw rod 105 to increase a distance between the slits 106. Since the slits 106 are formed up to an upper portion of the distal end of the screw rod 105, the screw rod is inserted into the spinal pedicle in a state where distal end segments of the screw rd 105 are in contact with each other when the screw rod is inserted into the spinal pedicle. If the insert 110 is inserted into the hollow 102 after the spinal screw 100 is inserted into the spinal pedicle, the distal end segments of the screw rod 105 become spaced apart from each other. As described above, if the spinal screw 100 is inserted into the spinal pedicle in a state where the distal end segments of the screw rd 105 are in contact with each other, it is possible to prevent the spinal pedicle of a patient from be damaged. In the meantime, the spinal screw 100 is made of titanium that is harder than the spinal pedicle, and the distal end segment of the screw rod 105 is formed to be sharp. Thus, unless the distal end segments of the screw rod 105 expand, the spinal screw can be inserted into the spinal pedicle in a state where the distal end segments of the screw rod 105 are spaced apart from each other.
[29] The insert 110 has a bar shape with a sharp portion formed at one end thereof and a threaded portion 114 formed at the other end thereof. In addition, the insert 110 has a tool-receiving groove 112 formed on an upper surface thereof so that the insert can be rotated by means of a tool such as a screwdriver. The tool-receiving groove may have a slot or cross shape.
[30] Fig. 2 shows a use state of the spinal screw module according to the first embodiment of the present invention. If the insert 110 is inserted into the hollow 102 of the spinal screw 100, the distal end segments of the screw rod 105 are spaced apart from each other and a distance between the slits 106 is increased to thereby be expanded. When the body of the screw rod 105 is expanded in the spinal pedicle, the screw rod 105 comes into closer contact with the spinal pedicle to prevent the coupling between the spinal screw and the spinal pedicle from loosening or the spinal screw from being separated from the spinal pedicle by physical activities.
[31] Hereinafter, a spinal screw module according to a second embodiment of the present invention will be described.
[32] Fig. 3 is an exploded perspective view of the spinal screw module according to the second embodiment of the present invention, and Fig. 4 is a sectional view of the spinal screw module according to the second embodiment of the present invention.
[33] Referring to Fig. 3, a spinal screw module according to the second embodiment of the present invention comprises a spinal screw 200 having a screw rod 205 fixedly inserted into a spinal pedicle and having a hollow 202 formed in a central portion of a body of the screw rod 205 and a plurality of slits 206 for slitting the body in the longitudinal direction, and a head 201 formed in an upper portion of the screw rod 205 and having a U-shaped recess 204 and a threaded portion 203 formed in the head; a first insert 240 to be inserted into the hollow 202 through a distal end of the screw rod 205; a coupling ring 230 provided between the screw rod 205 and the first insert 240 to restrict the distal end of the screw rod 205; a second insert 210 formed with a fixing recess 214, which is open at one side thereof so that the second insert can be coupled to an upper portion of the first insert 240; and a washer 220 to be inserted into the hollow 202 of the screw rod 205 so as to determine a location of the second insert 210 in the hollow 202. [34] The spinal screw 200 includes the screw rod 205 inserted into the spinal pedicle and the head 201 provided for linking the rod thereto. As compared with the spinal screw 100 shown in Fig. 1, a structure of the head 201 of the spinal screw 200 is the same as that of the head of the spinal screw 100 except that a sharp portion is not formed at a distal end of the screw rod 205.
[35] A threaded portion is formed on a surface of the body of the screw rod 205 to allow the screw body to be rotated and thus inserted into the spinal pedicle. The hollow 202 is formed in the body of the screw body so that the first insert 240 and the second 210 can be inserted into the hollow. In addition, the plurality of slits 206 are formed at regular intervals on the body of the screw rod 205 in the longitudinal direction of the body. The slits 206 are formed on the body of the screw rod 205 in the longitudinal direction and formed up to a position spaced apart from the distal end so that the distal end is not divided.
[36] The coupling ring 230 is coupled to a distal end of the screw rod 205, wherein the coupling ring 230 restricts the distal end of the screw rod 205 and is fixed to the distal end of the screw rod 205 by inserting the first insert 240. Here, the coupling ring 230 is used for preventing the distal end of the screw rod 205 from bursting and expanding by pressure when the spinal screw 200 is inserted into the spinal pedicle and then the body of the screw rod 205 is expanded.
[37] A threaded portion 242 is formed on a distal end of the first insert 240 and a wing
244 is formed on the other distal end for restricting the distal end of the screw rod 205. The wing 244 formed on the first insert 240 distributes the force generated by rotation uniformly to the distal end of the screw rod 205 when the second insert 210 is rotated. The wing 244 also prevents the distal end of the screw rod 205 from being in direct contact with the spinal pedicle of a patient, so that a damage of the spinal pedicle can be prevented.
[38] The fixing recess 214 having one side opened and a threaded portion formed therein is formed in the second insert 210, and the second insert 210 is inserted into the hollow 202 through the head 201. The distal end of the screw rod 205 is fixedly inserted into the fixing recess 214. The second insert 210 has a tool-receiving groove 212 formed on an upper surface thereof so that the second insert can be rotated by means of a tool such as a screwdriver and the like.
[39] Prior to inserting the second insert 210 into the hollow 202 of the screw 200, the ring-shaped washer 220 is inserted into the hollow. The hollow 202 is formed with a catching protrusion 202 for positioning the washer 220, so that the washer is placed on the catching protrusion. The catching protrusion is formed at a depth corresponding to a length of the second insert 210, so that when the washer 220 is inserted into the hollow, the second insert 210 can be prevented from being moved downward below the catching protrusion. The washer 220 prevents the second insert 210 from being forcibly moved downward in the hollow 202 by the coupling force between the first insert 240 and the second insert 210 when the second insert 210 is rotated.
[40] Fig. 4 shows a use state of the spinal screw module according to the second embodiment of the present invention. If the spinal screw 200 is inserted into the spinal pedicle of a patient and the second insert 210 is then rotated, a coupling degree between the threaded portion 242 of the first insert 240 and the fixing groove 241 of the second insert 210 is increased. Due to the increase of the coupling degree, pressure is applied from the wing 244 to the distal end of the screw rod 205, so that the body of the screw body 205 is bent and the width of the slits 206 is increased to expand the body of the screw rod 205. If the body of the screw 205 is expanded as described above, the screw body 205 comes into closer contact with the spinal pedicle to prevent the coupling between the spinal screw and the spinal pedicle from loosening or the spinal screw from being separated from the spinal pedicle by physical activities.
[41] In the meantime, although not shown in the drawings, a spinal screw module according to a third embodiment of the present invention will be described as follows.
[42] The spinal screw module according to the third embodiment of the present invention has the structure similar to that of the spinal screw module according to the second embodiment.
[43] Here, the slit is formed on the spinal screw fixedly inserted into the spinal pedicle up to the distal end of the screw rod, and a connection portion is formed for connecting the distal end segments of the screw rod to prevent the distal end segments thereof from being spaced apart from each other. In a process of coupling the first insert with the second insert and completely inserting the first insert into the hollow of the screw rod, the connection portion of the distal end segments of the screw rod is broken to allow the body of the screw rod to be expanded. In a structure of the first insert, at this time, a threaded portion is formed on one side of the first insert so that the first insert can be coupled with the second insert, and a protrusion structure is formed on the other side thereof so that the protrusion structure is inserted into the hollow of the screw rod and breaks the connection portion to thereby expand the distal end of the screw rod.
[44] In the protrusion structure formed on the first insert, an inclined surface is formed on a side of the protrusion structure, i.e., on a surface which is in contact with the screw rod so that the first insert is easily inserted into the hollow, and a sharp portion is formed on the other side thereof so that the first insert is easily inserted into the spinal pedicle. As the shape of the protrusion structure suitable for the foregoing, a rhombic or diamond shape may be used, so that the connection portion can be easily broken to expand the body of the screw rod.
[45] In this embodiment, since the first and second inserts should be coupled with each other to expand the distal end of the screw rod, there is no need to utilize the coupling ring, which is used in the second embodiment. [46] The scope of the present invention is not limited to the embodiments described above and the scope of the present invention is determined and defined only by the appended claims. [47] Although the specific embodiments of the present invention have been described, it will be readily understood that various modifications can be made thereto without departing from the scope of the present invention. Therefore, the scope of the present invention is not limited to the embodiments described above but is defined by the appended claims and the equivalents thereto. [48]
Industrial Applicability [49] In a spinal screw module according to the present invention, a body of a screw is expanded and then securely fixed to the vertebrae of a patient, so that the coupling does not loosen or the spinal screw is not separated from the spinal pedicle by physical activities. Consequently, the spinal screw module can be used semi-permanently. [50] Accordingly, the spinal screw module according to the present invention can be valuably employed in surgical operation regarding various spinal pedicles.

Claims

Claims
[1] A spinal screw module, comprising: a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod and a plurality of slits for slitting the body in a longitudinal direction, the head being formed at an upper portion of the screw rod and having a U-shaped recess and a threaded portion formed within the head; and an insert to be inserted into the hollow so as to increase a distance between the slits.
[2] The spinal screw module as claimed in claim 1, wherein the screw rod comprises distal end segments brought into contact with each other, and the distal end segments are constructed to be spaced apart from each other when the insert is inserted into the hollow.
[3] The spinal screw module as claimed in claim 1, wherein the screw rod comprises distal end segments spaced apart from each other.
[4] The spinal screw module as claimed in claim 1, wherein the insert has a threaded portion formed on an outer circumferential surface of an upper end of the insert so that the insert can be inserted into the hollow while being rotated therein.
[5] The spinal screw module as claimed in claim 1, wherein the insert has a tool- receiving groove formed on an upper surface of the insert so that the insert can be rotated by means of a tool.
[6] The spinal screw module as claimed in claim 1 , wherein the hollow is formed to have a diameter gradually decreasing toward a distal end of the screw rod.
[7] A spinal screw module, comprising: a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod and a plurality of slits for slitting the body in a longitudinal direction, the head being formed at an upper portion of the screw rod and having a U-shaped recess and a threaded portion formed within the head; a first insert to be inserted into the hollow through a distal end of the screw rod, the first insert having a threaded portion formed at one side thereof and a protrusion structure formed at the other side thereof to prevent the other side of the first insert from being inserted into the hollow of the screw rod; a coupling ring provided between the screw rod and the first insert to restrict the distal end of the screw rod; a second insert formed with a fixing recess, the fixing recess being open at one side thereof so that the second insert can be coupled to an upper portion of the first insert; and a washer to be inserted into the hollow of the spinal screw so as to determine a location of the second insert.
[8] The spinal screw module as claimed in claim 7, wherein the slits are formed in a trunk part of the body of the screw rod in a longitudinal direction of the screw rod such that distal end segments of the screw rod can be brought into contact with each other.
[9] The spinal screw module as claimed in claim 7, wherein the protrusion structure of the first insert is a wing for restricting the distal end of the screw rod.
[10] The spinal screw module according to claim 7, wherein the second insert has a tool-receiving groove formed on an upper surface of the second insert so that the second insert can be rotated by means of a tool.
[11] A spinal screw module, comprising: a spinal screw having a screw rod and a head, the screw rod being fixedly inserted into a spinal pedicle and having a hollow formed at a central portion of a body of the screw rod, a plurality of slits for slitting the body up to a distal end of the screw rod in a longitudinal direction, and a connection portion for connecting distal end segments of the screw rod, the head being formed at an upper portion of the screw rod and having a U-shaped recess and a threaded portion formed within the head; a first insert to be inserted into the hollow through the distal end of the screw rod, the first insert having a threaded portion formed at one side thereof and a protrusion structure formed at the other side thereof, the protrusion structure having an inclined surface and a diameter larger than that of the hollow so as to break the connection portion and expand the distal end segments of the screw rod when the protrusion structure is inserted into the hollow; a second insert formed with a fixing recess, the fixing recess being open at one side thereof so that the second insert can be coupled to the threaded portion of the first insert; and a washer to be inserted into the hollow through the head of the spinal screw so as to determine a location of the second insert.
[12] The spinal screw module as claimed in claim 11, wherein the protrusion structure formed at the first insert has a sharp portion at one side thereof, and a rhombic or diamond shape with the inclined surface at the other side thereof.
PCT/KR2007/003485 2007-05-31 2007-07-19 A spinal screw module WO2008146981A1 (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012006463A2 (en) * 2010-07-08 2012-01-12 Warsaw Orthopedic, Inc. Expandable surgical implant
CN102579120A (en) * 2012-02-23 2012-07-18 北京市富乐科技开发有限公司 Full built-in expandable anterior spinal fixation system
WO2012174815A1 (en) * 2011-06-23 2012-12-27 厦门大博颖精医疗器械有限公司 Lock-pin central nail device
WO2013173544A1 (en) * 2012-05-16 2013-11-21 Expanding Orthopedics Inc. Expandable bone fixation element
CN103654936A (en) * 2012-09-17 2014-03-26 上海微创骨科医疗科技有限公司 Pedicle screw with barbs, and pusher and method for forming pedicle screw
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09313502A (en) * 1996-05-27 1997-12-09 Bristol Mayers Sukuibu Kk Fixing device for bone
US6443989B1 (en) * 2000-12-04 2002-09-03 Roger P. Jackson Posterior expandable fusion cage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1006954B (en) 1985-03-11 1990-02-28 阿图尔·费希尔 Fastening elements for osteosynthesis
US5489210A (en) 1994-05-13 1996-02-06 Hanosh; Frederick N. Expanding dental implant and method for its use
KR100395253B1 (en) * 2000-09-28 2003-08-21 (주)태연메디칼 Backbone fused implant
KR100410823B1 (en) 2002-03-07 2003-12-18 Kyung Won Medical Co Ltd Inflatable bone junction cage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09313502A (en) * 1996-05-27 1997-12-09 Bristol Mayers Sukuibu Kk Fixing device for bone
US6443989B1 (en) * 2000-12-04 2002-09-03 Roger P. Jackson Posterior expandable fusion cage

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WO2012006463A2 (en) * 2010-07-08 2012-01-12 Warsaw Orthopedic, Inc. Expandable surgical implant
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WO2013173544A1 (en) * 2012-05-16 2013-11-21 Expanding Orthopedics Inc. Expandable bone fixation element
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US10154866B2 (en) 2013-08-26 2018-12-18 Kyungpook National University Industry-Academic Cooperation Foundation Medical inserting apparatus
EP3040039B1 (en) * 2013-08-26 2023-01-25 Kyungpook National University Industry-Academic Cooperation Foundation Medical insertion device
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